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It's purely a matter of how you start WireMock, so it's available to anyone. Start it as so:

java -jar wiremock-standalone-2.35.0.jar --enable-browser-proxying

Or in docker:

docker run -it --rm \
  -p 8080:8080 \
  wiremock/wiremock:2.35.0 \
  --enable-browser-proxying

Stubs can of course be created using the JSON API as usual, using header matching. Then it's a matter of configuring

<http://localhost:8080>

as the proxy for whatever client you are using. There are docs here on browser (or "forward") proxying: https://wiremock.org/docs/proxying/ - search for "Running as a browser proxy".

Thanks @Rob Elliot for your answer.

Then it’s a matter of configuring

<http://localhost:8080>

as the proxy for whatever client you are using.

I see, and the example mentioned with Java, and if I am using any other language I need to search how to configure it to point to

<http://localhost:8080>

as a proxy, right?

Yes